As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 2945, LT PGB OIL TEMP FLUCTUATES. AIR RETURN TO DTW. MAINTENANCE REPLACED TEMP BULBS. MAINTENANCE INSPECTED ELECTRICAL CONNECTORS AT LT PROP OIL TEMP GAUGE AND AT TEMP BULB. NO DISCREPANCIES NOTED. MAINTENANCE REMOVED AND REPLACED LT PGB TEMP BULB. ALL WORK IAW SF3 MM CHAP 79. OPS LEAK CHECK GOOD IAW SAME.